from otree.api import *

class C(BaseConstants):
    import os
    import random
    path=["D:\Otree\picture"]
    files=os.listdir(path)
    d=random.choice(files)
    os.startfile(d)

    import glob, random
    file_path_type = ["D:/Otree/picture"]
    images = glob.glob(random.choice(file_path_type))
    random_image = random.choice(images)